cc: Remove unused proto conversion code.

cc/trees/layer_tree.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TREES_LAYER_TREE_H_
 #define CC_TREES_LAYER_TREE_H_
 
 #include <memory>
 #include <unordered_map>
 #include <unordered_set>
@@ skipping 174 matching lines @@
   HeadsUpDisplayLayer* hud_layer() const { return hud_layer_.get(); }
 
   virtual void SetNeedsFullTreeSync();
   bool needs_full_tree_sync() const { return needs_full_tree_sync_; }
 
   void SetPropertyTreesNeedRebuild();
 
   void PushPropertiesTo(LayerTreeImpl* tree_impl,
                         float unapplied_page_scale_delta);
 
-  void ToProtobuf(proto::LayerTree* proto, bool inputs_only);
-  void FromProtobuf(const proto::LayerTree& proto);
+  void ToProtobuf(proto::LayerTree* proto);
 
   MutatorHost* mutator_host() const { return mutator_host_; }
 
   Layer* LayerByElementId(ElementId element_id) const;
   void RegisterElement(ElementId element_id,
                        ElementListType list_type,
                        Layer* layer);
   void UnregisterElement(ElementId element_id,
                          ElementListType list_type,
                          Layer* layer);
   void SetElementIdsForTesting();
 
   void BuildPropertyTreesForTesting();
 
   // Layer iterators.
   LayerListIterator<Layer> begin() const;
   LayerListIterator<Layer> end() const;
   LayerListReverseIterator<Layer> rbegin();
   LayerListReverseIterator<Layer> rend();
   // ---------------------------------------------------------------------
 
  private:
-  friend class LayerTreeHostSerializationTest;
-
   // MutatorHostClient implementation.
   bool IsElementInList(ElementId element_id,
                        ElementListType list_type) const override;
   void SetMutatorsNeedCommit() override;
   void SetMutatorsNeedRebuildPropertyTrees() override;
   void SetElementFilterMutated(ElementId element_id,
                                ElementListType list_type,
                                const FilterOperations& filters) override;
   void SetElementOpacityMutated(ElementId element_id,
                                 ElementListType list_type,
@@ skipping 83 matching lines @@
   // external embedder.
   EnginePictureCache* engine_picture_cache_;
   ClientPictureCache* client_picture_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTree);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_H_